Chemistry · Class 11 · Chapter 2

Structure of Atom

12 lessons134 min8 simulations10 practice questions

This chapter opens Dalton's indivisible atom and finds electrons, protons and neutrons inside it, then follows the models that tried to arrange them: Thomson's, Rutherford's and Bohr's. Light turns out to come in packets (quanta), hydrogen glows only at fixed wavelengths, and electrons behave as waves, which leads to the quantum mechanical model with its orbitals, four quantum numbers and the rules for writing electronic configurations.

Also called: atomic structure · quantum numbers · Bohr's model · electronic configuration

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Lessons

12 lessons · 134 min

01Discovery of sub-atomic particlesNCERT §2.19 min 02Thomson and Rutherford modelsNCERT §2.2.1; §2.2.2; §2.2.511 min1 sim 03Atomic number, isotopes and isobarsNCERT §2.2.3; §2.2.411 min1 sim 04Wave nature of electromagnetic radiationNCERT §2.3.18 min 05Planck's quantum theory and photoelectric effectNCERT §2.3.212 min1 sim 06Atomic spectra and the hydrogen spectrumNCERT §2.3.38 min 07Bohr's model of the hydrogen atomNCERT §2.4; §2.4.1; §2.4.215 min2 sims 08Dual behaviour of matter and uncertainty principleNCERT §2.5; §2.5.1; §2.5.29 min 09Quantum mechanical model and quantum numbersNCERT §2.6; §2.6.18 min 10Shapes and energies of orbitalsNCERT §2.6.2; §2.6.315 min2 sims 11Filling of orbitals and electronic configurationNCERT §2.6.4; §2.6.5; §2.6.611 min1 sim 12Chapter reviewMust-know facts, traps and formulas17 min

Simulations

8 in this chapter

Fire alphas at gold foilIn: Thomson and Rutherford models Build a nuclideIn: Atomic number, isotopes and isobars Light that knocks out electronsIn: Planck's quantum theory and photoelectric effect Bohr's ladder and hydrogen's linesIn: Bohr's model of the hydrogen atom One electron, bigger nucleus: H, He⁺, Li²⁺, Be³⁺In: Bohr's model of the hydrogen atom Count an orbital's nodesIn: Shapes and energies of orbitals Why 4s fills before 3dIn: Shapes and energies of orbitals Fill the orbitals, one electron at a timeIn: Filling of orbitals and electronic configuration